Skiving machine



Dec. 13, 1927. 1,652,513

M. H. BALLARD SKIVING MACHINE Filed Oct. 5, 1925 3 SheetS-Sheet l 7 171 F1 gil/ K 2 I m I I I F1 .5. Figw y Dec. 13, 1927. 1,652,513

M. H. BALLARD SKIVING MACHINE Filed Oct. 3, 1925 5 Sheets-Sheet 2 M. H. BALLARD SKIVING MACHINE Filed Oct.

Dec. 13, 1927.

5, 1925 3 Sheets-Sheet 3 WVE/VTUFL Z W 6 Fig.8.

Patented Dec. 13, 192 7.

UNITED STATES PATENT OFFICE,

MILTON n. BALLARD, OF. BEVERLY, iVIASSAOHUSETTS, nssrenonj '10 Unrrnn SHOE MACHINERY CORPORATION, or r nrnnson, NE 'JnnsnY, aconronarron or NEW JERSEY.

SKIVING IVIACI'IINE,

This invention relatesto skiving machines and is herein illustrated as embodied in a machine of the Amazeen type.

In machines of this type-the work is-fe'd to i a rotary 'disk knifeby a feed roll, the angle of the scarf produced'being varied by vary ing' the relative angular positions of theknife and roll. Either the knife or the roll may be angularly adjustable. In inachi'ne s in which the roll angularly adjustable, it is desirable, in order to facilitate the rapid adjustment of the machine,for producing different types of scarfs,that the axis about which the roll is adjustable should pass through an element of the rolladjacent to the knife (or through said elenient'ex tended) and that provision should be made for adjustment of the roll'relative' to said axis so as to locate the roll in various positions with respectto said'axis.

According to one feature of the invention,

the feed roll is mounted in a carrier which is angularly adjustable about. an axis passing through the element referred toabove, means being provided for relative bodily adjustment between the roll and its carrier so that the inner corner of the roll which is adjacent to the knife may be positioned in the axis oron either .sideof the axis as may be desired. In the illustrative construction the carrier is angularly adjustable about an axis which is substantially at right angles to and passes through an element or extended element of the rolladj'acent to the knife, said roll being adjustable with respect to the carrier in a direction at right angles to said axis so as to locate the inner corner of the roll in' the variousp'ositions which have been referred to above. With this construction,

as will be explained in detail below, the production of two different given scarfs' upon 'difierentportions of the same piece of work, and the change in adjustment so as'flto adapt the machine to produce twoscarfs different from the first two upon another piece of .work, are greatly facilitated;

It is desirable in machines of this kind proved mounting for algrinder is provided by which the grinderis readily adjustable toward and from the knife andv is compelled its mounting.

to run freely and true in any position to which it may be adjusted. In the illustrated construction, the grinder is fast to the projecting end of a conical head which extends through a conical-bearing, the pulley by which the grinder isdriven being arranged to surround the conical bearing.

These and other features of the invention, including certain detailsof construction and combinations of parts, will be described as embodied in an illustrative machine and pointed out in the appended claims.

Referring now tothe accompanying'drawmgsz- Figure 1 is 'a side elevation of a machine in which the present invention is embodied; 7

Figures 2 and 3 show two angular positions ofthe roll-with the inner corner-0f the roll located inside the axis about which the roll is angularly adjustable;

v F igures and 5 show two angular positions of the roll with the inner corner of the roll located. outside the same axis, a wider roll. being shown than that of Figures 2 and'3;

Figure 6shows a roll with its inner corner located in said axis;

Figure? is a plan of the machine;

Figure 8 chine,-

Figures 9 and 10 are, respectively, a sectional and a perspective view showing the construction and mounting of the knife grinder; and.

F igures 11 'and'l2 are, respectively, a front and anend elevation of the presser foot and Referring first to Figures ,4 to 6, the mounting of the knife'an'd roll and certain adjustments which can be made will be explained." The knife 11 is of the rot-ary disk t 'peand is adjustable toward and from the 1 01113 and horizontally in the plane of the drawing. .-The roll is mounted in a carrier which is angularly adj ustable about anaxis substantially perpendicular to and tangential to an element of the roll (or said element extended) which is adjacent to the knife, said axis being fixed and passing through the point 00. The'work 100 is fed by the roll (and a cooperating disk presently to be described) away from the observer in the direction of extentof the axis which passes throughthe point 00. The carrier in which the roll is mounted is adjustable angularly about the axis which passes through the point a1 into two positions, which may be determined by two adjustable stops, as will presently appear. When, therefore, it is desired to produce two scarts ot' diilerent character upon two portions of a piece of stock, the roll, the knife and the stops are so adjusted that the roll and knife are normally in position to produce one of the scart's, and de pression of a treadlc will tilt the roll into position to cause the other one of the scarfs to be produced.

For example, on a bal upper it is desi. ableto produce a feather-edge scar't along the lower margin where said niarn'in to extend beneath and be sewed to the upper margin of the ramp; and to produce a shoulder scaril along the front margin of such upper where said margin is to be folded to make a tin ished edge which will be Visible in the linished shoe. Figures 2 and 3 show the roll audknilte in positions to produce these two scar-ts. The roll is normally in the position shown in Figure 2 for the PIOdUCtlOIi of the feather-edge scarf. When the treadle is depressed, the roll is rotated in a clockwise direction into the position shown in Figure 3 for the production of the told or shoulder scarf. It should be noted that in these two positions of the roll, the upper inner (righthand) corner of the roll inside (to the right of) the axis which passes through the point y In the position of parts shown in Figures at and 5, the inner upper corner of the roll is outside (to the left of) the axis which passes through the point a this position having: been attained by adj listing the roll outwardly (to the lett) in its angular-1y adj ustable carrier. And, in order that the knife may occupy the proper position with respect to the roll, it has been adjusted to the left. The two j'iositions shown in Figures l. and 5 are suitable for skiving; cut-oil vanips. The position in Figure 4: is adapted to pro duce across the rear ends of the oi? the ramps two so-called seam scar'ls, such scar-Es as shown being short and abrupt. The position in Figure .3. caused by rotating the roll in a clockwise direction is adapted to produce a long, feather-edge scarf across the toe portion of the vamp. It will be understood a that the machine supplied with removable and replacez ble rolls of dillerent widths. the roll shown in Figures i and 5 being wider than that shown in the other figures so as to provide for the production of the long scarf shown in Figure In Figure 6 the parts have been so adjusted that the inner upper corner of the roll is located in theaxis which passes through the point a such adjustn'ient being adapted particularly for the production of scarits which differ only in inclination and not in the thicknesses of their edges.

Referring now more particularly to Figure 8, the mountings of theroll and knife will be described. The work is led away from the observer to the knife 11 by the feed roll 13 and a cooperating teed disk 15. The feed roll shatt extends through a bore in a block 16, which is horizontally slidable on an angularly adjiwlafbie carrier 'li", the righthand end otthe roll shalt extending into a cup 19 which is ccninected by a ball-andsocket joint with one member 2i. ol a role scopic shaift, the other nien'iber 23 of which is ctnunwttul by a hall-urid-socket joint with the hub oi a pulley 3.5. The right-hand end ot the roll shalt is held in the cup 1!) by a set-screw 27 so that the roll and roll shaft may readily be reinortal and re 'ihuzed, when, for exam ile, it is desirable tense a wider or a narrower roll or one ol a diti'erent shape. The block 10, by which the roll shaft is carried, is held in adjusted position in the car: rier 1"? by a clamp operated bya thumbscrew it). li hcn the thumb-screw is loosened, the block 16, and with it the roll, may be adjusted to the right or the left in order to position the upper inner corner of the roll with respect to the axis about which the roll carrier 17 is angularly adjustable in the manner which has been referred to in connection with Figures 2 to 6. A scale 31 on the block 16 facilitates such adjustment.

The carrier 1.7 slidable on two stationary curred guides (Fig.1) and held on these curved guides by curved gibs 37. The curve upon which the guides are termed is struck about an axis (see point of Figures 2 to (i) substantially 'ierpeinlicular to and tangential to an element of the roll (or said element extended) which is adjacentto the knife, said axis beingthus tangential to the periphery of the roll (or to the periphery extended). in order to provide means for tilting the carrier, by sliding it on the curved guides 35, a rod 59 is pivoted at its outer end at ill to the carrier 17, and at its inner end extends up t trough 1 herein a pin having a square head iii. The pin. is carried by spaced upright parts -15) ol' one arm of a bellairank lever, the other arm i? being pivoted to the upper end oi. a trcaulle rod ell). Stops 51, threaded on a stationary rod 52 andheld in adjusted position by set screws 58, limitthe nuweinent oi the square head ll-3 in either direction. A spring (not shown) urges the treadle rod all)downwardly at all times and normally holds the square head 413 against the right-hand stop :31. and the roll in its initial position,-that is in a position such as shown in l in'ures the treadle rod is pushed up by manipulation of a trcadle (not shown), the si'juare head moves intoconlnet with the left-hand stop 51, and the roll is swung clockwise into and l. lVhen Ion its second position,'that is into a position 7 5,that there is practically'no opening up of the space between its right-hand face and such as that'shown in Figure 3 or 5.; In the usual operation ofthe ma'chine theroll is caused to occupy one or the other of these two positions; but, of course, the operator may at any time hold the roll in any intermediate position. A scale on one of the gibs-37 and a pointer 57 onthe carrier 17 indicate to the operator the angular position of the roll. a V

It is desirable that the presser foot 59 and edge-gage (51 should be mounted for adjustment with the feed roll, and to this end they are 'm'ounted upon a bracket 63 which is pivoted about a. horizontal pin-G5 carried by afilug on the block 16; The bracket is normally held in the position shown by a springcatch (not shown) but may be swung down at any time about the pivot 65 when the "spring catch is released, to permit removal and replacement of parts. The gage 61 is fast tothe lefthand,end of a bar 67 slidable horizontally in a dove-tailed guideway formed in the bracket 63 and is held ther means for preventing '7 in adjusted position by a clamp 69." -The Presser-foot 59 is fast to the lefthand end. of a bar 71, whichhas at its right-hand end a curved portion extendingfreely around a pin 73 carried by lugs extending up from the bar 67,the right-hand extremity of the bar 71 being roundcdand extendingdown into a rounded socket formed in the bar 67. The right-hand end portion of the bar 71'is held against the inner face of a. lug 72 on the bar 67 through the pin 7 To this end (see Figure 12) the pin 7 3 is heldfrom moving to the right by a cotter pin 74 and has at its right-hand end a head. between which and the right-hand side face of'the bar 71 1s a spring 76'and a washer 78; By this construction the bar 71 which carries the presser foot is prevented from swinging about its longitudinal axis and at the same time may be readily removedand replaced. As a fur swingnw or twisting of the bar 71 c bout its longitudinal axis, a square pin 80, rigid with the edge gage, passes up through a rectangular hole in the bar 71 and in the stem of the 'press'erfoot 59. The right-hand vertical face of the presser-foot 59 should lie close to the adja cent vertical face ,on the edge gage in all positions of the presser-foot so as to prevent t-heledge of the leather from working up between these two members: The pre sent construction is designed with this end in view. The bar 71, itwill be noted, is in effect pivoted about the axis of curvature of the rounded socket 75, said axis being located at aconsiclei able distance from the presser foot, and just slightly above the operative face of said foot. The movement of the presser-foot within-the limits encountered in upper leather is so nearly vertical, due to the distance from the'foot to the rounded socket the adjacent face of the edge gage; At the same time, the footis freely movable up and down by reason of ,the'location of the axis of the rounded socket slightly above the loweriface of the foot. threaded into the gage bar 67 has beneath its head a. coiled spring which holds the presser bar 71 down yieldingly; and a stop screw 79 limits the downward movement of the presser bar. v

The feed disk 15 (Fig. 8) is carriedby the same angularly adjustable carrier 17 as is the feed roll so that the feed disk and the feed roll maintain their cooperative relation in any position to which the carrier 17 is adjusted. To this end an. upwardly extcnd *ing arm on the block 16, which, ashas been explained, is mounted on the bracket 17, has a split boss 81 to hold an elongated bearing A screw 77' 83'for a shaft 8 1. At its left-hand end this I shaft carries a spiral gear 85 (Fig. 1) which meshes with a spiral gear 86 on the shaft 87 of the feed disk, said shaft being mounted in vertically alined bearings in a member 89 which is rigid with the bearing 83. The bearing 83 is'adjustably held in place in the split boss 81 by a pinch screw 91 whereby the feed disk may beadjusted in a path parallel to the axis of the feed roll. A coiled spring .92 (Fig. 1) extends down into a socket in the shaft 87 of the feed disk, a

thumb-screw 93 being provided for varying the tension of the spring. The horizontal shaft 8% is connected at its right-hand end by a ball-and-socket joint with one portion 95 of a telescopic shaft, the other portion 97 of which is connectedby another ball-andsocket joint with a short shaft '99 to which is fast a small pulley 101. With the above] construction, it will be apparent that the feed disk partakes 0f the angular adjustments of the feed roll and may be adjusted with respect to the roll in a path parallel to the axis of said roll. a

I Referring 'now more particularly to Figure 7, the feed roll 13 is driven by a belt 103 which passes around the pulley 25 and around one step 105 of a pulley which is fast to a countershaft 107, a belt tightener pulley 109 being provided for maintaining the belt 103 taut. If it is desired to increase the speed of rotation of the feed roll, the

127. The feed disk shaft, which carries at one end the smallpulley 101, is driven from the counter-shalt 107 by a belt 108 which passes around said pulley, around a pulley 129, on the countershalt 107, around an idle pulley 131, located below the pulley 101', back around a pulley 1232 also on the countershalt 107 and back to the pulley 101?.

It will be noted from an inspection of the sizes oi the various pulleys in Fig. 7 that the feed disl-z is rotated at a faster rate than is the feed roll. the long belt 108 with its double run is, however, n'iaiiitained "fairly loose, so that it will slip it at any time the operator holds hack on the work as it is passing between the :teod roll and food dish, such holding back being desirable when sharply curved edges, such l'or example as throats ol vanips, are eniu'mntcred.

The ltni'l'e l1 driven by a belt 12-35 (Fl 1) which passes around a large pulley .127 last to the drive shalt and around a small pulley 1235) last to the knife shalt, a tightener pulley 111 being provideil for this belt. llhe lcniil'e,it will be understood, may be adjuz eied toward and troin the :leed roll as is usual in machines of this general type by manipulating an adjusting screw 1 13. The knife ti le. 8) may also be adjusted horizontally in a direction siilwantially par allel to the cod roll shaft and, to this end,

carried in a. bracket 1115 having a horizontal tongue which is receired in a suitably sl'iaped horizontal. groove or guideway 1&7 in the l'raine ot the machine. The bracket has in it a horizontal slot 1 -1-8) through which extends a clamping screw which is threaded into the frame 01 the machine, a handle 151 being; provided. for convenient manipulation of inc clamping screw. As shown in Figure 7, a scale on the :traine of the inacliinc and a marl; on the Mill e-carrying bracket 1-15 are provided for the convenience of the operator.

The fJjlllllllll ln'achet 155i isrigid with the bracket which carries the lcnil'i and there- 'lore djusted when the huile ln'acltet adjusted. Referring; now more partiimlai'ly to Il ie nrcs l) and 10, the mounting oi? the grindor will. he described. Slidahle in a bore in the bracket 1.5;} is: a. sleeve and mounted in this sleeve is a short shalt 1:77. The lower end of this shalt has a. conical head which {its in a conical bearing 159 carrieijl by the sleeve. The upper end of the shalt 157 has a. conical socket to receive the conical end of a small screw 1131 which is threaded into the upper end of the sleeve 155 and holds the conical head at the lower end of the shalt in its conical hearing. A locl-:-nut 1G3 holds the screw 161 in adjusted posi on. The grinder 165 has a conical bore in its center to lOCElVG the lower portion of the conical head of the shait157, and fill":- tened to said conical head by a screw 167. A belt 169 (shown best in Figures 1 and 7) passes around a pulley formed on the grinder, under a tightener pulley 171. and around a. pulley 173 which is loose on the driving shaft 119 and adapted, as will presently be described, to be connected frictionally with the constantly rotating pulley 137 when desired. Y

Referring again to Figures 9 and 10, as well as to Figure 1, the grinder is urged (.lownwardly at all times toward the knife by a spring 175 which coiled about a stud 177 carried by the hracketlfill and has one end extending into a slot in the sleeve 155 and the other end resting against a part of the bracket, said spring tending at all times to urge the grinder toward the knife. In order to pcrinitthe operator to control the diwvnward movement of the grinder, a lever 17E), pivoted about the stud 177, has one end hearing against the upper wall of a slot in the sleeve andthe other end engaged by a screw 181 so that, by turning the screw in one direction or the other, the grinder may he moved from operative to inopera tire position, or vice versa.

lelerring now to Figure 7, it has been exolained that the pulley 173, which drives the grinder, may he clutched friotionally to the pulley 137 when desired. To this end, the

pulley 173 is slidablo as well as rotatable on the shaft 19, and there is looated between it and the pulley 137, a libre disk 183; la order to provide means for pushing the pulley 17 2:3 toward the pulley 137, when desired, a rod 181 (Fig. 1), slidahly mounted in the il'ranie 01 the machine and located directly beneath the driving shaft 119, carries at that end which adjacent to the pulley 173 a fork in the arms of which are mounted small rollers 187 (Fig. 7). The other end of the rod is engaged by one arm 189 of a bellcrank lever which is pivoted to the frame of the machine at 191. the bell-crank lever is ')ivoted to one end of a rod the other end oi. which ei-zteuds to the front oi? the machine and has a head 197. When the rod is pulled. to the right, as viewed in Figure 7, the small rolls 187 cugage the pulley 173 and push it toward the pulley 137 so as to cause the pulley 173 to be rotated by the pulley 137 and rotation thus imparted to the grinder 1.65.

Referring again to .Figure 9, it will he noted that the plane or the belt 169 where it passes around the grinder pulley is located about midway between the upper and lower ends 01 the conical bearing, member 1.79, and that the taper of the conical hearing member and of the head oi? the grinder shaft 157 is gradual. \Vhen the grinder is rotated. by the belt there is a slight tendency for the conical head to rise so thatthegrinder turns freely. no screw 161 is so adjusted, however, that the extent oil the riseis very small. The grinder shalt thus rotates freely with its lower end in the hearing 159 and its up The other arm 1.93 of Hill per end engaged by the pointed screw 161, It will alsobe notedthat, when the adjusting screw 181 is manipulated to raise or lower the grinder, the sleeve 155 is raised a pivot 204 byina-nipulating a thumb screw 206, the bracket being adapted to. be clamped in adjusted position by turning a hand lever 208. Having thus described my invention, what I claim as new and desire to secure by'Letters Patent of the United States is l l. A machine of the class described. haw

' ing, in combination, askiving knife, a feed roll, a carrier by which the feed roll is supported, said carrier being angularly adjustable about an axis which is substantially perpendicular to an element, extended or otherwise, of the roll, and means whereby relative bodily adjustment between the roll and the carrier may be effected to position the inner corner of the roll in the axis or on either side of the axis as maybe desired.

2. A machine of the class described having, in combination, a 'skiving knife, a feed roll, a carrier by which the feed roll is sup ported, said carrier'being angularly adjustable about an axis which issubstantially perpendicular to an element, extended or otherwise, of the roll, and means for adjusting the roll with respect to the carrier to position the innercor-ner of the roll in the axls or on either side of the axis as may be desired.

3. A machine of the class described hav -1ng, 1n combination, a skiving knife, a feed roll, a carrier by which the feed roll is supported and with respect to which the roll is adjustable, a presser foot, an-edge gage, and connections between the-feed roll and the foot and gage such that the foot and gage are adjusted in unison with :the feed roll when said roll is adjusted with respect'to the carrier. v r v f LA machine of the class described having, in combination, a skiving knife, a feed roll, an angularly adjustable carrier by which the feed roll is supported and with respect to which the roll" is "adjustable, a presser foot, an edge gage, "and connections between the feed roll and the foot and gage suchthat the foot and gage are adjusted in unison with the feed rollwhen said roll is adjustediwith respectto the carrien 5. A machine of the class described having, in combination, a skiving knife, a feed roll, a block in which the feed roll is rotatably mounted, a carrier in which the block is adjustable, said carrier being angularly adjustable about an axis which is substantially perpendicular to an element, extended or otherwise, of the feed roll, and a presser foot and edge gage mounted on the block.

6, A machine of the class described having, in combination, a skiving knife, a feed 1-o1l, a feed disk cooperating with the roll to advance the work to the knife, and means for rotatin the feed disk com arisirm four a b pulleys arranged in pairs and a double-run belt passing loosely around said pulleys.

7. A machine of the class described hay ing, incombination, a skiving knife, a feed roll angularly adjustableto vary the inclination of the scarf produced by the knife, a feed. disk cooperating with the roll and angularly adjustable-with it, and means for driving the knife roll and dislgthe means for driving the disk comprising a universal joint and a telescopic shaft to permit ad justment of the disk with the roll.

8. A machine of the class described having, in combination, a skiving knife, a feed roll, an angularly adjustable carrier by which the feed roll is supported, a feed disk cooperating with the roll and also supported by the carrier, and means including uni versal joints for rotating the roll and the disk so as to permit the carrier to be adto receive said portion, a pulley rigid with justed while maintaining the rotation of the grinder and surrounding the conical bearing, and a driving belt passing around the pulley.

10. A machine of the class described having, in combination, a skiving knife, a

grinder for said knife, a rotatable shaft hav-ing a conical head at one end, a conical bearingthrough which said head projects, means for fastening the grinder to the projecting portion of said head, and means en- .gaging'the shaft to hold the head in the bearing.

11. A machine of the class described having, in combination, a skiving knife, a grinder for said knife, a rotatable shafti having a conical head at one end, a conical bearing through which said head projects,

means for fastening the grinder to the projecting portion of said'head, and a conical screw engaging asocket in the shaft to hold the head in the bearing. 12 A machine of the class described having, in combination, askiving knife, a

12:). A machine of the class described having, in combination, a slaving knife, a

bracket adjustable on the trame of the maclnne in which the knife 1s mounted, a supinirt rigid with said bracliet and having a conical bearing, a grinder shaft having a conical portion near one end received in said bearing, a grinder tor the knife fast to said conical portion, and an adjusting screw engaging the end of the shaft which is remote ifl'Olil the bearing.

14-. A machine of the class described having in combination a sliiving knife, affeed roll, a feed roll shaft, a carrier angularly adjnstaliile about an axis which is substantially perpendicular to an element, extended or otherwise, of the roll, and a block in which the feed roll shaft is rotatably mounted, said block being slidably adjustable on the carrier in a path parallel to the feed et-ting portion of said head, means for roll shaft and means {or holding said block in adjusted position. a a

15. A machine ofthe class described having in combination a shining knife, a feed roll, a feed roll shaft, a carrier angularly adjustable about an axis which is snbstantially perpendicular to an element, extended or otherwise, of the roll, and a block in which the feed roll shaft is rotatably mounted, said block being slidably adjust able on the carrier to position the inner corner otthe roll in the axis or on either side oi the axis as may be desired, and means "for holding; said block in adjusted position. a j

16. A machine of the class described having, in combination a rotary disk skiving knife, 11 't'eed roll for advancing Work to the knife, two curved gnideways, the center of wh ch lies in an axis Whichis tangential to an element of the roll at a point spaced tlfroin the inner end thereof, a roll carrier baring: curved guides located in. said guideways, means tor rotating the roll, and ineans for adjusting the roll carrier singularly While maintaining its rotation.

In tQStiiTlUll Y ii'hereot I have si ned 1n 1 '3 name to this specification.

MILTON I-I. BALLAR-D. 

